John sherman



(No Model.)

J. SHERMAN.

- I SCREW CUTTING DIE.

No. 252,060. Patented Jam-10,1882;

N, FETERS, Photo-liihogmphar. Washingnn, n.c.

' out removing the dies.

UNITED STATES PATENT OFFICE. I

JOHN SHERMAN, OF CLEVELAND, OHIO, ASSIGNOR OF ONE-HALF TO LEONARD H.BURT, OF SAME PLACE.

SCREW-CUTTING DIE.

SPECIFICATION forming part of Letters Patent No. 252,C60, dated January10, 1882.

Application filed January 17,1881. (No model.)

To all whom it may concern:

Be it known that I, JOHN SHERMAN, of Oleveland, in the county ofOuyahoga and State of Ohio, have invented certain new and usefulImprovements in Machines for Threading Bolts, which improvements arefully set forth in the following specification and accompanying drawing,in which the figure is aface view of a hand-tool for threading boltscon-' taining my improvements.

The nature and objects of these improvements will fully appear in thesubjoined description, when considered in connection with theaccompanying drawing, which objects are to supply a ready, simple, andeconomical means of setting and adjusting the cuttingdies for cuttingdiflerent sizes of bolts with- This I accomplish by the use of circularrevolvingly-adjustable cuttin g-dies, as hereinafter described andclaimed.

A is a plate, oblongin form,having rounded ends and a flange,a. This isthe base or foundation, to which the cutting-dies B B are fixed. In thedrawing it is seen provided with sockets at the ends for attachinghandles. The cutting-dies-B B consist of steel disks having circularrecesses made in their periphery, said recesses having thread-cuttingteeth I) 1), arranged so as to present two cutting-edges in each recessto the blank-bolt. These recesses vary in size, or, rather, are gradedin size, whereby a number of sizes of cutting-dies are provided in onedisk. The disks have a central opening or eye for placing them on pins 0c on the plate A, the said plate A holding a pair of said disks. Thesaid central opening or eye and the pins 0 a may be dispensed with inthe hand-machine, as the disks can be fitted into a round recess in theplate A,in which case the pins would not be necessary, the said openingsand pins being required only when the said disks are attached to .thelevers in a power-machine. In the flange a of the plate A are placed twothumb set-screws, d d, the points of which enter holes in the edge ofthe said disks, for securing them inplace. .The plate A has a centralopening, 0, through which the bolt passes as the cutting proceeds. Thesecutting-disks are readily adjusted to position by simply turning them ontheir pins to bring the size of cutting-recesses required together atthe center, and each pair of disks having half a dozen or so ofcutting-recesses enables the changing from one size to another a verysimple and easy operation. The said disks are also easily removable forreplacing them with others having different sizes of cutting-threads.They are so simple that any one can easily set or adjust them.

Having described my invention, 1 claim- The revolvingly-adjustable disksB B, having the several different-sized cutting-recesses I provided withcutting-teeth b b in their periphery, in combination with the plate A,having set-screws d cl and sockets for handles, substantially asdescribed.

JOHN SHERMAN.

Witnesses GEO. M. TLBBiT'rs', E. W. LAIRD.

